Valve core



FIG. 1 is a front elevational view of valve core showing my new design; the undisclosed rear elevational view thereof being a mirror image of the front elevational view;

FIG. 2 is a right side elevational view thereof, the undisclosed left side elevational view being a mirror image of the right side elevational view;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a cross-sectional view taken along line 5--5 of FIG. 3; and

FIG. 6 is a cross-sectional view taken along line 6--6 of FIG. 3. 

The ornamental design for a valve core, substantially as shown and described. 